[ python-Bugs-728515 ] mmap's resize method resizes the file in win32 but not unix

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Bugs item #728515, was opened at 2003-04-27 10:44
Message generated for change (Comment added) made by josiahcarlson
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Category: Extension Modules
Group: Python 2.2.2
Status: Closed
Resolution: Wont Fix
Priority: 5
Submitted By: Myers Carpenter (myers_carpenter)
Assigned to: Nobody/Anonymous (nobody)
Summary: mmap's resize method resizes the file in win32 but not unix

Initial Comment:
In the resize method under win32 you have something
like this:

	/* Move to the desired EOF position */
        SetFilePointer (self->file_handle,
                new_size, NULL, FILE_BEGIN);
        /* Change the size of the file */
        SetEndOfFile (self->file_handle);

Which resizes the file

Under Unix you need to call 

   ftruncate(self->fileno, new_size)

before calling remap() to make it do the same thing.


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Comment By: Josiah Carlson (josiahcarlson)
Date: 2005-05-30 16:32

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The problem still persists in Python 2.3 and 2.4.  A quick
read of mmapmodule.c shows that ftruncate() is not being
called within the non-windows portion of mmap_resize_method().

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Comment By: Facundo Batista (facundobatista)
Date: 2005-05-30 11:59

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Deprecated. Reopen only if still happens in 2.3 or newer. 

.    Facundo

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Comment By: Facundo Batista (facundobatista)
Date: 2005-01-15 09:55

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Please, could you verify if this problem persists in Python 2.3.4
or 2.4?

If yes, in which version? Can you provide a test case?

If the problem is solved, from which version?

Note that if you fail to answer in one month, I'll close this bug
as "Won't fix".

Thank you! 

.    Facundo

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Comment By: Martin v. Löwis (loewis)
Date: 2003-05-04 05:36

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Would you like to contribute a patch? Please make sure to
include changes to the documentation and test suite.

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